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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b16a8e9fe8b5bc8b9b988d02951efe5a059e54892c9e832ac8063a695b117d0' 
  AND token = 'zTcZZIH/l3/qH4vH94NQJ9Ky/tpXYQ7Kqa5IYY50A5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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