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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90957ca362bc1a8ec749f12dd180f62ce36d1dc51fa2a41722820a83c7a3c0d4' 
  AND token = 'e2gtn95LG780VlJ0VAV9raJKkmQNkvkX3H3dNIBMbzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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