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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f42e86ec72885939d0c833832d4a6821eb91b9ec6cf6384e410c8b60bf2eba' 
  AND token = 'ZHgNFAXhQQEkjU1xgfW0ocefg46W0h6L7CGVdPE/B+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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