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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb69bd29066aa471deaa3e733501b7769f301adf144406aca80ab1e2b9970f8' 
  AND token = 'ct/+tjyqNb1n1yiOwsKcznM/094k6jSUtUd6fGGGlF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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