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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b345232558c1280c9387bdc0b92bf60ad19533da37136799712f97eb3b836f71' 
  AND token = 'GOU5aT2D8BpufBZxgCjNXOOnPZw66k31jBfGPdPnWCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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