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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08428ffcfed2529ea3a13f235810c54fa6ffab2b36da5abf25e13a6e9e9f02e4' 
  AND token = 'g2wHhO3FdRmVrzzQ2KvoSVGGEE9N0+KYUpXSsPZNzOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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