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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf48ef0fd56a39cf321848b5bc0ea76122642fd11961b152ef5ce2fed47fe1a' 
  AND token = '/RDFymCyAKnCXWVllOma0YzR4w7EN7ON2WqHFjDhT8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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