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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e1f9bdd1ee49b54a4fb393d87b1a48b8ea80e35a98bf6c67f9b89df45a2a7b' 
  AND token = 'Q5NIczwfGAj7omE/Qgxh+h65l1TsQEW4xgigo4sJzxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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