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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631dee9bb047d79e00024a1cb0cc9d895b78ce2332fde8880a706513618ff737' 
  AND token = '6JcuTAL7QTiIku3/hk6GT7P4Q0P5uOK3LeaYMOP+5os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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