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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d9e9b53218655660b2be5c3d1d3de64fb2c34e79dd6024ea205ba9711411d2' 
  AND token = 'g2T1kaxts4SOy/vapW0/TtSrQFFFkPBGDbPeeTYqdUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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