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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707ab0ddf8414ffb6554e1b70c0d3d844624a92fd1a7e0d967011557962d1285' 
  AND token = 'lOO775UjasCaTxImP4+X2w+NzQrjAIkQEWUfQo7ccY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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