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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8140283fe0b02eccfc781a11a38646a4ade19e5ff92738f1b04df7cbc05aec' 
  AND token = '2unEvDsRQfS9y7xBM3aGGJNp277KRLHkpMasLTkHkts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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