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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0665d018e4c63b62fb2b7803d95c1820c585e75ecc80235b2fd1b34104b4418a' 
  AND token = 'Lc5xhbmp99zEDp71z8Gu7tcNPupEggt1TFTYIEAPR+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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