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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8966e41ad03511f7db571bbeb843166062abf55dec1346ead1b28a79ac1c6f97' 
  AND token = '5E98g27OCYqhS1tOHP1d3gY+vbIv1/d1knl8h4umMSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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