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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b5db2495a1a38d7d67032f2fd25cd8fbe97f9a421de3f0f98b9bbf7326d81a' 
  AND token = 'JhefTTkkJbeZK4YLJ9PcDVSeb5q0rWYRZFU32gB0HU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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