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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa575a2403dbe4ccf8cac202a9e622e025725a432a0c67fa4886a10f8cd7e72e' 
  AND token = 'tA4G8beWX13p7VouXOVcUbQZjrDB4Xdzw2eALLF2a3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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