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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c084f9a420d71292e59d9d5f29b496e55a616d3d2440aaeefb7ffc4dedf81dc8' 
  AND token = 'Y5ZhcZQA+JubC31X2cV+XYuyUgq/UWNB92dt18dabA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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