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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7b679a8cc9fac6c0068863b0f65875426a0569740db9a8c472b43c056268e3' 
  AND token = 'EGItpMvGS9zfWJ4Kdd299xX9O0PHnv+3CPDBafXyFx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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