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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563ae960300d670ba718df95c9fc2b58be51b59d8b3e64aed695f662b1311fcc' 
  AND token = 'mM3fLCm3Hze/+QSGm8RkVcasJhg7Rqg9O/6j5DgonN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}