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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bc9a873c8cab2d12011a384828fe0a8f9f8dd6900fccd887a417bae8b1dd51' 
  AND token = 'q1+Wqj0hgPnsdJduXOhZ77pjMuGAFl2G0FF5RG80v4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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