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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ec3e9ed6020c2ed490240667985a66183e635cc16c415c14f603f68bf4d043' 
  AND token = 'WOqLx93yMEn0UeMvJroy2AdWGCGQ/OjufstZmdIFrgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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