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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5f2ca194c5fb74596a6a41d2608f940c75306fe28bfa15a0e65961357b8345' 
  AND token = 'AB1pJK415qf9d3B6p/rOdoYnlrE0Lr55KutU5ygJqw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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