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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acdc66441170ffd1be113177559e0e51a16321e5d0115896cd2c6000f5e466b7' 
  AND token = 'Dy22A87m1WT5BVb6TZ/qVxOUDgKK7SfNNmPwO4YJkw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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