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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b6cebbf6c979bdccd0aba3da958b003c7428af1e3af72e0ba57170f54471f0' 
  AND token = 'fojmvYbyOeji0DHDIbkjXjqmR0clYfuunPeRdn7Q5OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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