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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e42398a8923c439f42f9cb6ff4f7adac9ddab8e339534769a8f4a161791faf' 
  AND token = 'svqebSxw9nLic9BK14J6BBbZwmkmsltn1oYrWceNOwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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