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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe658e57489940a280c2df144496296dab1a913ea72e54726fe1e02e291aaa17' 
  AND token = 'Im16Sdh26+C4iGhea48P9KnCOwouzgTk0zhwYix+Gf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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