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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2dac2fc6145d7422b14a9f6630cbde6c10919fd58ce87bb83fef73735f4f41' 
  AND token = 'hmyN/snegH4Wgcqw7+p4HDnn+djj15Go5axBopM/AA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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