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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cece095e0f0ea7edcdef4795b74eb1dc0e91b34e47bb81455929e3de2eda3b9' 
  AND token = 'XJkxqujk6/FpdusFbBB/sqOjkK4l+Dc1dZ+hK+Raqvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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