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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313b190184a407633b494c1cf01f91e6892dd4d5550dade06c97c976f99c356d' 
  AND token = 'jWeTHuhwhuytJ7TsLeKZgB2/KO64Pfa9rM24DcoXqo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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