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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025f538b36a88123173e9c764fb445f85923daa105ebd90c142b40c5a85cef01' 
  AND token = '3NvahUP4MgJpuI8M/2mD8AvxtPXR80fx8WqHtj+2NRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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