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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855ed4125e4051c29efdf92e4db51c5ddae846cfb77f8352648a398baace53b3' 
  AND token = 'S5LUrrh18tm6QZgdGfwyydJTpMS6cznmfY37Qf3tT8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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