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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc72751503befa697de2e482cc5ddb3641ac3c92f47cf47710fc93e009ff58f0' 
  AND token = '7KjGktE8wopza8H6t72kgjyhH2tkZINlTq9rcY6zrq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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