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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e96c590a91976bbad7cad9bb3e8ce2b6d7358ec882f6d41f2adb3e2276911f' 
  AND token = 'yqZyegOvFrd0UZ1UGqVJuXqTFL7DMjnyZIa2YO2SFfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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