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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1318ec9ee561347093e61c6f7a29e50b124283af9834f9bd6bf64a8dbd7b8bc3' 
  AND token = 'W/QezCHg+QntUbz483F3mf0hEHkIBE+Sl4XA0L8qKUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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