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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11984a4f23f5364f98c851f2c4a8816017352d62565898e986f82b1e887d697b' 
  AND token = 'WEmGbul9sUGrbEvtAKgL8/dpj1Szs5OaAGLHsy67HCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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