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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0f0080dd0d31e5883d75a2e2efc9bdb493eba7d0f7ba8e3f2e92295ba7d813' 
  AND token = 'UN55uphgGa/WhTLbBNWZDJ7y7Cu6S/KF/NBtOR+of5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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