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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ffac5a82a8aa7718c7fe13436912ed78d956462875886166d44a7cc277738c' 
  AND token = 'F7Sw0uw100G2PPsNW+PoKhKPuzQLL/9C+0tQp59nP2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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