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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ea3d4231f1b9c02347b2816f27c968b7115a54ff4c622f549c211f5307b3a0' 
  AND token = 'tZPLrxfiyAlkqiSGJd+FQ2kr3YAL+H9n6qRB1F0tAt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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