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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042ab85d967e3a8d13f18aafb6d203ff418e7b7486bbf0fffe412844a2ba33c0' 
  AND token = 'JZXFUnSeSO/z/hrZmwsnyJnJagYpEb9l72fm3s50Gvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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