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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8380979c94336420ce26fd6cbdf43f685e6ec98d0e6b9c815d3ae32af4e643f4' 
  AND token = 'Qcb3KZzyNaIsHf+hnWc403K3o98nILN3qGtgJyPi4YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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