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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e640c311279c2d9df1b89d07cbbbdfb4c7650e4bb7532a1db39c071f58ae9dc' 
  AND token = 'uL4KZG62lzGMmYaWUlS0B8nEVO+Bpt1+Pu5cBAMJx2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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