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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1ef32c8f6044c20d020ce4eee4df8a93e3cde5bb054c50c30ab48a31a38303' 
  AND token = '252fJ0WV/WUGKSrevVglIPCNHi7hjbXVOlzlC0VwNr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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