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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1898b364695ac2b8600fc08e06f5a3fe7524fdbe29a8e0cb776e41745fdfb151' 
  AND token = 'PcsuZvdF5jQtE82jAWsaR7FQjyBSj+3a7JnY7w5QrCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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