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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8810eef503e4c247e9575c6a9a5a860e426f091c3c8a5f48429580d373207b9b' 
  AND token = 'W/AuY1Zg2hr699Q8UnKgU1GzkvE6Ul7zwASMApd6yWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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