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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96c1b898a40fd1ec64bee0a3b199befcb73ce61818d3d3eceb79d1152eddbb0' 
  AND token = '6Is2neQ7ZX34nvmzz4S3Khdsbyfy//RJmdN5ko6xymM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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