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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce5a69d04addb8c2132017dcc66d8cc28f1f3c4e6bf36c8f80bd1c6e00dfdb5' 
  AND token = 'Jg2vA2+c/I/TYtgHJVY5JEDnLRpmVpnhB0/fYZ1Xy2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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