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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe488cbe3e2da73853d10174ae5cc5c8faa36b15112a4f6cc4ca97e5c386d33' 
  AND token = 'ePHhfdGyPioV0vXTpFS58bX5JQJho2yaepF9RBfsQtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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