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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc6e0b34c0ad5f7333fcb59c38cc1477ba9ac1768e18cfe0b16e8c5b581d699' 
  AND token = 'S/hSl6Le5yReMKfJi1/vWvLnVVBPrxB9qIwcnVhXZbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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