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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3999ed0b94b4f98fa4cf1834d5cb58943916a26da4b822a539aacfe7e73d54a' 
  AND token = 'wdeiep8W3A0nmyNkRsMnob1p7eKLfi68T7fxizh1gMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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