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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f60f61a5f421471111adec540b53ce347ea7bc8f6523a632dbcc629a2865f21' 
  AND token = 'OcoQfBMxK2/M9URGdHxygWIEaE1uATTc1f49ckzf2GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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