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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e113b4f24cc502f12fe65aea856ba075d8ce1cd88a67bb5798febe45baeb7a3d' 
  AND token = 'd/fFVGn5XQOelR4nGpPoyvhL5Fqo/V2gMQ+ufG1xWSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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