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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0422dddaeb913578cbf9f540b393b994b001c77997d4a924cf0f29b95e2bf4b2' 
  AND token = 'sNEfclKW/6b2xG2pvuNNOKeWb0NfpJx+Bnf2DvHxFbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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